.mheader {
    background-color: #303133;
    width: 1400px;
}
.mymenu_a{
    display: flex;
}
.mmenu{
    background-color: #303133;
}
.mmenuitem{
    font-size: 18px;

}
.mmenuitem:hover{
    background-color: #303133 !important;
}

.maside {
    height: calc(100vh - 60px);
    background-color: #303133;
    padding-left: 15px;
}
.mmain {
    height: calc(100vh - 60px);
}
  .el-menu {
    border-right: none;
}